I don't know what to do this summer?

I went to one party and to a lake this summer. Thats it and I have been bored waiting around my house for something to do. I'm having a pool party in a couple weeks but thats pretty much it. My grandma is coming up the day after my birthday for 10 days and my parents won't let me leave during that time because they think its rude. I don't want this to be another boring summer. Please help me cure my boredom! :(